NDVI

Tucker et al. (2005) compile the global NDVI data, based on the AVHRR satellite sensors, for each of 8km square cells with a bimonthly frequency between July 1981 and December 2004, by improving the methodology over the previous attempts.

• The data is supposed to be available here, but as of April 2017, it's out of service.

The NDVI data for 2001-2006, based on MODIS satellite sensors (better data quality than AVHRR but only for more recent periods), is available here.